Your browser isn’t supported any longer. Update it to get the finest YouTube expertise and our newest options. Learn more : a subjective unit of loudness for an average listener equivalent for the loudness of the 1000-hertz seem that has an intensity 40 decibels higher than the listener's personal threshold https://geschaftsziel.de/innovatives-sonnenschutzdesign-elektrische-und-masgeschneiderte-sonnensegel/